Just last week Chrysler recalled 1.4 million vehicles after hackers revealed a software bug. Now, a new hack exposes a vulnerability in GM vehicles equipped with OnStar. Users of the iOS RemoteLink app are encouraged to update ASAP.

Our greatest security weaknesses are revealed at the annual BlackHat and DefCon conferences, where hackers gather to show off their most compelling work. Meanwhile, Facebook prepares to fly its own drones.